Fujitsu AB*G14LVTA Service Instructions Manual page 33

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
For AO*G18/ 24LAT3
Outside air temp. Outside air temp.
> 3°C > -1°C
Outdoor HEX Outdoor HEX
temp.Below temp.Below
-8°C -12°C
Heating operation start : Compressor ON
Normal defrost
Outside air temp. Outside air temp.
> -5°C
Outdoor HEX Outdoor HEX
temp.Below temp.Below
-14°C
Outdoor HEX temp. : Over 10°C
Compressor ON time: Maximum 15 minutes
(Not defrosted for 6 or 10 minutes)
Intermittent operation
< -5°C
=
-16°C
Defrost start
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
28sec later 4WAY valve : OFF
34sec later Compressor : ON
or
Defrost end
01-28
Integrating defrost
Continuous operation
Compressor Compressor
OFF count : integrating
40 times operation:
(Less than 10min.) Over 210 min.
When the
compressor is
stopped,
If detected outside
air temp. at 2°C